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Do you want a 10.5mm f2 prime?

Started Jul 22, 2015 | Polls thread
Dave Lively Senior Member • Posts: 1,938
Re: Do you want a 10.5mm f2 prime?

tpani wrote:

There is a Nikon FX lens AF-S 20mm f/1.8. Size is 82 x 84 mm, weight 355 g.

Scaling this down in every dimension by a factor of 2 gives a lens of size 41 x 42 mm, and if all components would be similarly made smaller, the weight would be 44 g (1/8th). Of course, realistically, the lens would be heavier, probably over 100 g, similarly to the 12mm f/2.0 Olympus (size 43 x 56 mm), which is 130 g.

Comparing the Nikon 50mm f1.8 to the Olympus 25mm f1.8 I am not seeing the 2 to 1 reduction in linear dimensions you are assuming. That only seems to be valid for super telephoto lenses. The Nikon AF-S 50mm f1.8 is 71 x 53 mm and weighs 185 g. The Olympus 25mm f1.8 is 56 x 41 mm and weighs 136g. If the same scale factors present in the 50 -> 25 comparison are applied to the Nikon 20 the theoretical m43 10mm lens would be 65 x 65 mm and weigh 261g.

A 10mm m43 lens would probably be smaller and lighter than that since the SLR lens has to be designed so a flapping mirror does not hit the rear element. But it would still be larger and heavier than the Olympus 12mm. It would probably be more expensive too but that depends on what quality level it was built for. A wide, fast prime is not a typical consumer item so I would expect both the quality and cost to be high.

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